You can have OS 7-8-9 - like windows by unchecking "open new windows in coumn view" under the Finder preferences. And select "always open folders in new window." Now open your hard drive icon and click on the list view icon. now if you want, remove the sidebar by dragging its divider to the left. Now click the lozenge-shaped button on the upper right of the window. Most or all double clicking on folders will now open them up in either list view or icon view, just as in OS 7 and 8 and 9.
Mac OS 7.5: Better than Tiger Will Ever Be
Mac OS 7.5: Better than Tiger Will Ever Be